The growth and the evolution of supermassive black holes (hereafter SMBHs) is one of the fundamental problems of modern astrophysics. SMBHs accrete from the surrounding accretion disks and the accretion rate is typically stochastic, characterized as a red-noise process, i.e. the amplitude of variability rises towards longer timescales as a power-law function. However, some galactic nuclei exhibit peaks in the luminosity that deviate from the red-noise flickering. In recent years, X-ray satellites have detected a few sources, where such large ourbursts repeat in a quasiperiodic way every few hours or days. They were called Quisiperiodic Eruptions (QPEs). These outbursts exceed the quiescent level by one to two orders of magnitude in flux density and their spectral energy distributions are consistent with being thermal with the characteristic temperature of about million Kelvins. In this bachelor thesis, the student will consider X-ray light curves of the known QPE sources. The student will characterize the power spectral densities of the light curves, in particular, they will compare the power spectral density slopes and the periodogram peaks among individual sources. Next, they will study correlations between the basic quantities, e.g. the mean period vs. flare duration or other characteristics determined from X-ray spectra or host galaxies (flare temperature, SMBH mass etc). Finally, the student will evaluate the shape of the flares (their degree of symmetry/asymmetry) and they will discuss the result in the astrophysical context. For example, they may consider a model of the formation of a small accretion disk that is quickly consumed or shocks between the streams of gas moving relativistically around the SMBH. Depending on the student’s interests, they may consider just one source in detail or consider all known QPE sources. In addition, a physical model may be constructed to interpret/fit the observed flares.